PDF malware analysis — malicious · 1087fb93753d6370

MALICIOUS

PDF

20.0 KB

MD5: 02c8accf314b0684ca122192173a499c SHA-1: d26d9f4b2532f23bfd31244cf4a6031f1edacc95 SHA-256: 1087fb93753d6370d4c1699e9cdb813345f27b287ed185b114cd3188a09769df

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that exploits CVE-2007-5659 using the Collab.collectEmailInfo function. This script is designed to download a second-stage payload from the URL http://www.webguild.org/tech_old/.svn/.l.php?l=1&spl=pdf_collab_email, as indicated by the 'PDF_JS_SHELLCODE_DOWNLOAD_URL' heuristic. The use of eval() and unescape() functions, along with complex string concatenation, points to a deliberate attempt to hide malicious code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.webguild.org/tech_old/.svn/.l.php?l=1&spl=pdf_collab_email

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `1b4aabc016183f8ff238bd84c7bba2b8f463f9041c432e9a485bb2286bd6ffcc`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3700 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111712_001.js` `16da57ff06b137b45ed3d56a47f608cf2eaf2f3fb5febd350c7edf3b89102a7e`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1038	14694 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111713_002.js` `77dc9e0316319d559dbfe671de7ad2bcb6bf60af6fa86949dd5f5903d7fb7df4`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x49D4	1514 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111711_003.js` `943aaf16cae3711f01c229c5d2cbacbf50b92c6eef7a5b5788eab500620a6551`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	20063 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 16 long base64-like blob(s).
`javascript_obj111712_004.js` `e6e99ea46246bc6d24d4ee0e38223f869180a76f3a9536412b4efe28f63528f8`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x105C	16309 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 11 long base64-like blob(s).
`javascript_obj111713_005.js` `bf3e98713a4d26727703b7096d1f0dc309242891effb57db11a10f9b0a937f4b`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x49F6	1563 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `5b834cb777e4b751deef8a00c9ea05090b3429d2751ac04cee72959262540f14`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1038	1475 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `893b6a69a6b1f96ef94da875e2c6de5a6ab10d72b7676187c78f81073910b29c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x49D4	80 bytes
`legacy_pdfkit_stage_002.js` `9e3282ad65396bdfa8c48173a9104b8176ace5305cfb84750b98e616c7d6fdf8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1556 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `d3db9f8b285452f7e209a81869cee19b7b4eea1c81d8784d612adcf0c9ad1d0d`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1038	7865 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s).

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